A zinc ion in the active site of an enzyme can speed up the reaction by:

A. Making a bound water molecule a more powerful nucleophile by drawing electron density toward itself and facilitating deprotonation of the water

B. Orienting substrates for reaction

C. Stabilizing an anionic intermediate

D. All of these

E. None of these

The role of serine at the active site of serine proteases is to act as a ___ catalyst, while the histidine residue serves as an ___ catalyst.

A. acid-base, covalent

B. anionic; ionic

C. covalent; acid-base

D. strong; weak

E. weak; strong

The active site of an enzyme is being investigated by mutagenesis to determine the stability of the enzyme conformation following substrate binding. A leucine is replaced by glycine. This change will:

A. Destabilize the enzyme

B. Stabilize the enzyme

C. Have no effect on the enzyme

Draw the pedigree for the question below, take a picture or a scan, and upload it here.

Text of the question: Defects on the SOX21 gene are suspected to be Y-linked and to cause baldness in men. A bald man and woman with normal hair have two sons and two daughters, and both sons are bald. The two daughters have each two sons, and none are bald. The man's sons also have two sons each, and all four are bald. Draw a pedigree for this family using standard symbols.

Explain or discuss the biological and environmental factors that influence the survival of infectious agents or microorganisms

How does the Near Attack Conformation (NAC) contribute to enzyme function? How can an enzyme put a substrate into an energetically unfavorable conformation? How does modern drug design utilize NAC? Please go into detail, provide examples, and use diagrams to help illustrate your explanation. Especially use diagrams please.  

NAC means "Near Attack Conformation". I am struggling to understand how all of these relate. Thank you so much for the help!

What is complex media and when would you use complex media over using chemically defined media?

A common bacterial organism used for various procedures in the microbiology lab is micrococcus Luteus. In the space below please correct the organism's name in proper binomial nomenclature.

In your own words, explain the difference between resident flora and transient flora.

Film Review: Rock Pocket Mice of the Desert Southwest
1. The rock pocket mice come in two variations:
a. Light mice which are found: _________________
b. dark mice which are found: _________________
2. What organisms provide the selective force in the mouse population:

3. How did the dark mice originate?

4. What determines the value of a mutation?

5. What is the explanation for the dark mice having a light underbelly?

6. Mutation is a ____event; but ____ is not.

7. Dark color is considered a(n) ___________ which improves survival.

Describe how bacterial DNA transfer from one cell to the others.

How are the reagents/antibodies placed inside a pregnancy test (please be practical and in detail), explain how the antibodies stay within the strip

What are two differences in the process of gene expression between prokaryotes and eukaryote and why?

Assume you have isolated S.aureus from your skin. Design an experiment on how would you determine whether it is penicillin and erythromycin resistant? (Make sure to include a hypothesis and how you would design the experiment. Also include proper controls and discuss briefly the techniques you would use). I need one page please.

In the tubular flowers of foxgloves, wild-type coloration is red while a mutation called white produces white flowers. Another mutation, called peloria, causes the flowers at the apex of the stem to be huge. Yet another mutation, called dwarf, affects stem length. You crossed a red-flowered plant (gene symbol, r) to a plant that is dwarf (gene symbol, d) and peloria (gene symbol, p). All of the F1 plants are tall with red, normal stem flowers. You cross an F1 plant back to the dwarf and peloria parent, and you see the 543 progeny shown in the chart.

Dwarf, peloria stem, white 172

Tall, peloria stem, red 56

White, Tall, normal term 48

Red, dwarf, normal stem 6

Red, dwarf, peloria stem 43

White, tall, peloria stem 5

Red, tall, normal stem 162

Dwarf, normal stem, white 51

1) Which alleles are dominant?

2) What were the genotypes of the parents in the original cross?

3) Draw a map showing the linkage relationships of these three loci(R, D, P)